Yokogawa EJX930A User Manual
Page 66
<10. General Specifications>
10-2
IM 01C25R01-01E
Output specifications for HART Protocol Type “◊”
Output
Dual output (Both analog and pulse/contact
output can be obtained simultaneously).
In this case refer to the item “Wiring example for
analog output and status/pulse output”.
HART Protocol Revision
HART protocol revision can be selected from 5
or 7 when ordering.
The protocol revision can be changed by user
configuration.
Note: Protocol revision supported by HART
configuration tool must be the same or higher
than that of the EJX multivariable transmitter.
Protocol revision supprted
by HART configuration tool
5
7
Protocol revision of
EJX multivariable
transmitter.
5
7
Í
: Communication OK
Í
: Communication NG
Analog Output
Two wire 4 to 20 mA DC output, user-selectable
for Differential Pressure, Static Pressure,
External Temperature or Flow Rate signal.
Failure Alarm
• Analog output status at CPU failure and
hardware error
Up-scale: 110%, 21.6 mA DC or more
(standard)
Down-scale: –2.5%, 3.6 mA DC or less
• Analog output status at process abnormality
(Option code /DG6);
The result of process abnormality detected
by the advanced diagnostic function can
be reflected to an analog alert status. The
following three setting modes are available.
Mode
Burnout
Fall back
Off
Standard
110%, 21.6mA or more
Holds to a
specified
value withun
the output
range from
3.8mA to
21.6mA
Normal
output
Option
Code
/C1 -1.25%, 3.8mA or less
/C2 -1.25%, 3.8mA or less
/C3 103.1%, 20.5mA or more
Pulse/Contact Output
Pulse or status output is selected by parameter
setting.
Transistor contact output (sink type).
Contact rating:
10.5 to 30 V DC, 120 mA DC max.
Low level: 0 to 2 V DC. (See figure below for
high and low levels (pulse output).)
HIGH level
LOW level
0 to 2 V
0V
F1001.ai
Pulse Output
Scaled pulse or frequency pulse output is
selected by parameter setting.
Scaled Pulse Output Function
Pulse is output by the unit of the scaled flow rate.
Scaled pulse can be totalized.
Frequency Output Function
Number of pulses output per second at 100% of
output.
Pulse frequency: Max. 10 kHz
Duty cycles: Approx. 50% (1:2 to 2:1)
Contact Output Function
High or low alarm
Status signal output mode can be reversed
(ON/OFF).
Signal Output (for HART protocol type)
Output
Flow
rate*
1
Differential
pressure
Static
pressure
External
temperature
Total
flow*
1
4-20mA
*
3
*
2
Pulse output
High/Low
alarm
*1:
When Measurement Function Code B is specified.
*2:
Square root output is not available. Low cut linear
mode is not supported.
*3:
Reversed output is not available.